Update VPE to EVPE channel

Why is this change being made?

I just noticed that the #vpe slack channel in the handbook has been renamed and wanted to quickly rename it to the new name. However, I am not sure how this should have worked since the #vpe link redirects to #evpe, and we may bring on a #vpe in the future (at which point we should just add the channel back in addition to #evpe?)

Does this MR meet the acceptance criteria?

Conformity

• Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what